The invention discloses an activated carbon biological turntable coupling artificial wetland system, which comprises an activated carbon biological turntable and a vertical flow artificial wetland in series; The wetland pool body is provided with a water inlet room, a water treatment room, and a water outlet room in sequence from left to right. The water treatment room is laid with gravel layers, ceramsite layers, and photocatalytic filler layers in sequence from bottom to top, and aquatic plants are planted. , the photocatalytic filler layer is composed of bismuth titanate / cerium oxide composite material supported on coarse sand. The present invention proposes an activated carbon biological turntable coupling artificial wetland system, combining the strong photocatalytic properties of bismuth titanate itself and the strong adsorption and stability of cerium oxide, which can significantly increase the adsorption and degradation of pollutants in water bodies, It has the characteristics of recycling, harmlessness, high purification efficiency and large sewage treatment capacity, and can be applied to the purification treatment of urban black and odorous water bodies.